libstdc++
ov_tree_map_/split_join_fn_imps.hpp
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1 // -*- C++ -*-
2 
3 // Copyright (C) 2005-2020 Free Software Foundation, Inc.
4 //
5 // This file is part of the GNU ISO C++ Library. This library is free
6 // software; you can redistribute it and/or modify it under the terms
7 // of the GNU General Public License as published by the Free Software
8 // Foundation; either version 3, or (at your option) any later
9 // version.
10 
11 // This library is distributed in the hope that it will be useful, but
12 // WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 // General Public License for more details.
15 
16 // Under Section 7 of GPL version 3, you are granted additional
17 // permissions described in the GCC Runtime Library Exception, version
18 // 3.1, as published by the Free Software Foundation.
19 
20 // You should have received a copy of the GNU General Public License and
21 // a copy of the GCC Runtime Library Exception along with this program;
22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 // <http://www.gnu.org/licenses/>.
24 
25 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
26 
27 // Permission to use, copy, modify, sell, and distribute this software
28 // is hereby granted without fee, provided that the above copyright
29 // notice appears in all copies, and that both that copyright notice
30 // and this permission notice appear in supporting documentation. None
31 // of the above authors, nor IBM Haifa Research Laboratories, make any
32 // representation about the suitability of this software for any
33 // purpose. It is provided "as is" without express or implied
34 // warranty.
35 
36 /**
37  * @file ov_tree_map_/split_join_fn_imps.hpp
38  * Contains an implementation class for ov_tree_.
39  */
40 
41 #ifdef PB_DS_CLASS_C_DEC
42 
43 PB_DS_CLASS_T_DEC
44 void
45 PB_DS_CLASS_C_DEC::
46 split(key_const_reference r_key, PB_DS_CLASS_C_DEC& other)
47 {
48  PB_DS_ASSERT_VALID((*this))
49  PB_DS_ASSERT_VALID(other)
50 
51  if (m_size == 0)
52  {
53  other.clear();
54  return;
55  }
56 
57  if (Cmp_Fn::operator()(r_key, PB_DS_V2F(*begin())))
58  {
59  value_swap(other);
60  PB_DS_ASSERT_VALID((*this))
61  PB_DS_ASSERT_VALID(other)
62  return;
63  }
64 
65  if (!Cmp_Fn::operator()(r_key, PB_DS_V2F(*(end() - 1))))
66  {
67  return;
68  }
69 
70  if (m_size == 1)
71  {
72  value_swap(other);
73  PB_DS_ASSERT_VALID((*this))
74  PB_DS_ASSERT_VALID(other)
75  return;
76  }
77 
78  iterator it = upper_bound(r_key);
79  PB_DS_CLASS_C_DEC new_other(other, other);
80  new_other.copy_from_ordered_range(it, end());
81  PB_DS_CLASS_C_DEC new_this(*this, *this);
82  new_this.copy_from_ordered_range(begin(), it);
83 
84  // No exceptions from this point.
85  other.update(other.node_begin(), (node_update*)(&other));
86  update(node_begin(), (node_update*)this);
87  other.value_swap(new_other);
88  value_swap(new_this);
89  PB_DS_ASSERT_VALID((*this))
90  PB_DS_ASSERT_VALID(other)
91 }
92 
93 PB_DS_CLASS_T_DEC
94 void
95 PB_DS_CLASS_C_DEC::
96 join(PB_DS_CLASS_C_DEC& other)
97 {
98  PB_DS_ASSERT_VALID((*this))
99  PB_DS_ASSERT_VALID(other)
100  if (other.m_size == 0)
101  return;
102 
103  if (m_size == 0)
104  {
105  value_swap(other);
106  PB_DS_ASSERT_VALID((*this))
107  PB_DS_ASSERT_VALID(other)
108  return;
109  }
110 
111  const bool greater = Cmp_Fn::operator()(PB_DS_V2F(*(end() - 1)),
112  PB_DS_V2F(*other.begin()));
113 
114  const bool lesser = Cmp_Fn::operator()(PB_DS_V2F(*(other.end() - 1)),
115  PB_DS_V2F(*begin()));
116 
117  if (!greater && !lesser)
118  __throw_join_error();
119 
120  PB_DS_CLASS_C_DEC new_this(*this, *this);
121 
122  if (greater)
123  new_this.copy_from_ordered_range(begin(), end(),
124  other.begin(), other.end());
125  else
126  new_this.copy_from_ordered_range(other.begin(), other.end(),
127  begin(), end());
128 
129  // No exceptions from this point.
130  value_swap(new_this);
131  other.clear();
132  PB_DS_ASSERT_VALID((*this))
133  PB_DS_ASSERT_VALID(other)
134 }
135 #endif
constexpr const _Tp * begin(initializer_list< _Tp > __ils) noexcept
Return an iterator pointing to the first element of the initializer_list.
constexpr const _Tp * end(initializer_list< _Tp > __ils) noexcept
Return an iterator pointing to one past the last element of the initializer_list.